64491634569 has 8 divisors (see below), whose sum is σ = 86007071392. Its totient is φ = 42985310400.

The previous prime is 64491634549. The next prime is 64491634609. The reversal of 64491634569 is 96543619446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64491634569 - 2²⁰ = 64490585993 is a prime.

It is a super-2 number, since 2×64491634569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64491634549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2261632 + ... + 2289969.

It is an arithmetic number, because the mean of its divisors is an integer number (10750883924).

Almost surely, 2^64491634569 is an apocalyptic number.

It is an amenable number.

64491634569 is a deficient number, since it is larger than the sum of its proper divisors (21515436823).

64491634569 is a wasteful number, since it uses less digits than its factorization.

64491634569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4556327.

The product of its digits is 16796160, while the sum is 57.

The spelling of 64491634569 in words is "sixty-four billion, four hundred ninety-one million, six hundred thirty-four thousand, five hundred sixty-nine".